Gas burner



May 26, 1925.

L. B. METTLER GAS BURNER Filed 001' 25, 1925 ATTORNEY,

INVENTOR: LEE: B. ME-n'll/AV.

Patented May 26, 1925.

' LEE B. METTLER, DE LOS ANGELES, CALIFORNIA.

GAS BURNER.

Application filed Octolbr 25, 1923. Serial No. 670,770.

To an it may concern Be it known that 1, Lin: B. METTLER, a citizen ofthe United States, residing at Los Angeles, in the county of Los Angelesand State of California, have invented new and useful Improvements inGas Burners, of which the following is a specification.

My invention particularly pertains to improvements in the multiple typeof gas burn: ers of the class which are especially adapted for use inboilers, in furnaces and in combustion chambers in general.

An object of my invention is to provide a burner embodying .a multiple 7arrangement of gas and air mixing tubes by means of which it is adaptedtooperate economically with fuel gas under a wide range of pressures,and Without the necessity of supplying secondary air.

Another object is to provide a gas burner embodying air and gas mixingtubes 'in which air is entrained into a stream of gas at an acute anglewithin the mixing tubes,

thereby insuring a thorough intermingling of the gas and air at theircritical point of mixture, and which burner has associated therewithmeans for affording a proper air regulation.

Another object is to provide a gas burner which is simple inconstruction and which is adapted to be readily installed.

A further object is to provide a gas burner which is so constructed asto provide a highly efficient gas burner unit of large capacity relativeto its size.

With the foregoing objects in view, together with such other objects andadvantages as may subsequently appear, my invention resides in theparts, and in the construction, combination and arrangement of parts, orthe equivalents thereof, hereinafter described and claimed, andillustrated by way of example in the accompanying drawin in which iigure 1 is a view in front elevation of my assembled gas combustionburnerwith parts broken away, showing the air-regulating means.

Figure 2-is a view in section and front elevation as seen on the line 22of Figure 3, showing the mixing plate and gas distributor with partsbroken away.

Figure 3 is a view in cross section and side elevation of the burner,showing it as applied to a furnace,and illustrating the manner ofentraining. air an acute angle.

Figure 4 is a perspective view of the gas distributor.

Figure 5 is a view showing a modified form of the mixing tube.

Figure 6 is a detail in section illustrating a modified form of theburner nozzle showing it as' adapted to streams of fluid fuel.

More specifically A indicates the wall of a furnace which is providedwith the usual fire box B, and which wall is formed with an opening 2into which'is placed a mixing plate 3 preferably formed of cast iron butwhich may be made of any other suitable metal. The plate 3 embodies acentral parinto the gas at tition 4 formed with forwardly and rearwardlyextending marginal flanges 5 and 6, which flanges abut against the wallsof the opening 2. The central partition 4 of the mixing plate isprovided with a series of funnel-shaped air intake openings 7 the wallsof which project outward from the front face of the partition." Theopenings 7 have their largest diameter at a point forward of thepartition and have their smallest diameters terminating on a lineapproxidischarge multiple mately midway of the partition. Annularflanges 8 are formed on the rear of the partition and project from themargins of the small ends of the openings 7. The mixing plate isoutwardly extending walls of the openings 7 form the outer wall of asquare .socket or depression 9 into which is inserted a gas manifold 10which is of a general square contour to seat into the socket 9. The gasbox is provided with a plurality of. integral tubes 11 forming gasoutlet passages, which tubes radiate from the box 10 and arebent atright angles at their outer ends to form tapered nozzles 12, as is moreclearly shown in Figure 4. The radiating tubes 11 are so formed andarranged that the nozzles 12 thereon will extend into the air intakeopenings 7, there being a nozzle for each opening. Each nozzle '12terminates and delivers the as on the centerof the funnel shaped airintake opening 7 on an approximate line with the termination of thefunnel at its smallest diameter. A hole 13 is provided in the rear wallof the gas box 10 and the center of the socket in the mixing plate isalso provided with a hole so cast that at its center the gas box and thegas mixing plate in rigid relationship. The forward end of the gas boxis provided with a circular opening in which is screw threaded a gassupply pipe 16.

The flange 5 of the mixing plate surrounds and supports a refractoryblock 17 preferably formed of silicon carbide; the refractory blockbeing formed with apertures 18 which register with and correspond insize to the small ends of the funnel shaped openings. These aperturesconstitute mixing chambers or passages and are of such length as tobring the gas from the nozzle to a critical point of the mixture withthe entrained air before the mixture reaches the firing point in frontof the block. The block is provided with as many apertures as there areair openings in the mixing plate.

The aperture 18 of the refractory block may be formed to slightlydiverge from the inner section in the air passage, giving a Venturi tubeeffect as shown in Figure 5.

The opening 2 is fitted with a frame and door construction whichembodies a door frame 20 having an apertured depending wall 21,apertured to pass over the gas pipe 16; the wall having marginal flanges22 which extend into the furnace opening 2. The door frame and the gaspipe are connected together by a screw 24. The lower edge of the doorframe is providedwith outstanding lugs 25 and the lower edge of the dooris provided with lugs 26, the lugs 25 and 26 abutting and beingapertured to receive a bolt or screw to form a hinge mounting for thedoor 27; the door being of a general U-shaped character and adapted toswing into completely closed or opened position without binding againstthe gas supply pipe 16. The outer side of the door near its upper edgeis provided with a pin 28, and the door frame 20 is provided at its sideand near the upper edge with an outstanding lug 29 to which ispivoted,-as at 30, a notched bar 31. any one of the notches of which isadapted to be placed over the pin 28. This arrangement of pivotednotched bar and pin provides means for regulating the amount of airdelivered to theburner.

The accompanying'drawings show a combustion unit in which the generalcontour is square, so constructed to be inserted in a furnace door witha square opening, but it is to be understood that the combustion unitcan be constructed in any desired shape .to correspond with the shape ofthe opening in the furnace.

From the foregoing it will be seen that I have provided a gas burnerwhich embodies a multiple of independent gas and air mixing elements,which are arranged close together and open horizontally into a fire boxaround a common center. By this arrangement the gas delivered to theburner from the supply pipe 16 is divided into a plurality of finestreams each of which is discharged into a separate mixing passage whereit becomes thoroughly intermixed with air before being delivered to thefire box; each gas stream on its discharge from a nozzle acting to drawair into the mixing passage through the funnel-shaped air intakeopening, the inclined walls of which opening serve to direct the airinto the gas at an acute angle, which insures proper mixture of the airand gas. In this manner a more complete intermingling of gas and air isctiected than would be the case where a volume of gas corresponding tothat discharged from the plurality of nozzles is discharged from asingle nozzle, thus insuring practically complete combustion.

The door 27 serves as a means for regulating the air feed to the severalmixing chambers. and. enables the supply of a proper flow of air inproportion to the volume of gas discharged from the nozzle.

The refractory block serves to protect the metal of the mixing plate andthe burner manifold and distributing pipes from the intense heat of theflames in the fire box.

In some instances the nozzle 12 may be formed as shown in Figure 6, thatis, with a plurality of angularly disposed outlet apertures 33 soarranged as to direct multiple streams of the fuel diagonally into themixing apertures 18 so as to effect a greater admixture of the fuel andthe entrained air.

I claim- 1. In a gas burner. a plate formed with a series of air intakeopenings having tapered walls, a gas supply manifold, a'series ofradiating tubes on said manifold, nozzles on said tubes arranged todischarge gas centrally of the air intake openings, a refractory blockextending over said plate said block being formed with apertures whichregister with the small ends of theair intake openings which aperturesconstitute a multiple of gas and air mixing chambers.

2. In a-gas burner, a plate formed with a series of air intake openingshaving tapered walls. a gas supply manifold, a series of radiating tubeson said manifold, nozzles on said tubes arranged to discharge gascentrally of the air intake openings, a refractory block extending oversaid plate said block being formed with apertures which register withthe small ends of the air intake openings which apertures constitute amultiple of gas and air mixing chambers, and means for regulating theflow of air to the air intake openings collectively.

3. In a burner of the character described, a metallic plate having adepression on one III 2 fold seating on said plate on the side thereof aspaced thereby from the side thereof and formed with a Series of airinlet openings arranged around said depression, a refractory blockcovering said plate having a series of apertures registering with theopenings in the plate and constituting mixing chambers, a box-like gasmanifold seated in the depression, a series of radiating tubes leadingfrom said manifold, and nozzles on the outer ends of said tubesextending into the openings in said plate.

4. In a burner of the character described, a metallic plate having aseries of air inlet openings therein formed with marginal flanges. arefractory block covering one side of said plate and seating on saidflanges and face of said plate said block being formed with aperturesregistering with said openings, a gas maniopposite said block, and aSeries of nozzles communicating with said manifold and extending intothe openings in said plate.

5. In a burner of the character described, a plate formed withoppositely" extending flanges on its margin, said plate being formedwith a series of oppositely extending flanges on the margins of saidopenings, a refractory block covering one side of said plate and carriedby one of the marginal flanges thereof, said block seating against theflangesprojecting from one side of the plate around the openingstherein, said block being formed with apertures registering with theopenings in the plate, a gas manifold. and a series of gasnozzles'carried by said manifold extending into the openings in saidplate and spaced from the flanged margins thereof.

LEE B. LETTLER.

air inletopenings,

